Giviiis Cyprcea. 195 



Naria (Gray). 



Front of columella narrow, dilated into a sharp toothed 

 ridge, shell smooth. 



Type N. irrorata (Soland.). i sp, 



CvPRi^OVULA (Gray). 



Shell oval, ventricose, surface covered with elevated striae^ 

 aperture narrow, linear ; inner lip denticulated, outer lip 

 inflected and transversely striated. 



Two species — C. capensis (Gray), C. Adamsonii (Gray). 



Trivia (Gray). 



Shell oval, rather depressed, surface covered with 

 elevated, transverse ribs, or tubercles, spire concealed, aper- 

 ture narrow, inner lip sulcated, outer lip transversly grooved. 



Type T. Europa^a (Mont.). 34 sp. 



Subgenus PUSTULARIA (Swainson). 



Back with elevated tubercles, extremities slightly pro- 

 duced. 



Type P. pustulata (Lamk.). 4 sp. 



Subgenus Epona (H. & A. Adams). 



Shell globose, back smooth, or with elevated tubercles. 



Type E. cicercula (Gmel). 4 sp. 



These subdivisions are almost purely artificial, and do 

 not ahvays hold good. C. carneola (L.), for instance, has 

 two forms, one a typical Cyprmi, the other with flattened 

 base, would have to be placed in Aricia. I am inclined to 

 agree with Sowerby, Thes. Conch. III., in allowing merely 

 a subgeneric rank to Trivia alone, and entirely ignoring all 

 the others. In the early part of this year I received from 

 Mr. G. B. Sowerby a shell which, while it possesses the 

 facies, dentition, and raised striae on the lower surface, of 

 Cyprceoviila Capensis^ has the form as well as markings of 

 Liiponia Algoensis (these being Dr. Gray's types of his 

 two genera), and a new and most important link in the 



